一、单项选择（15个小题，每小题1分，共15分）
1. Faced with such an awkward moment, she could do nothing but _______ a smile.
A. give B. giving C. gave D. to give
2. You appear _______ a mistake. I remember it was Tom not Tim who broke the window.
A. to make B. making C. having made D. to have made
